Wind mitigation credits and your windows

Florida homeowners insurance has a mechanism most states do not. Carriers here rate a house partly on the features that reduce hurricane damage, and opening protection is one of them, alongside roof shape, roof deck attachment, roof-to-wall connections and secondary water resistance. A house that has those features and can prove it is priced differently from an identical house that cannot.

That is a mechanism, not a promise of a particular number on your renewal. How much it is worth varies by carrier, by policy and by the rest of the building, and it is entirely possible for opening protection to be worth a lot on one house and very little on another with a weaker roof. Your own agent is the only person who can tell you what it does to your premium, and asking before you buy is a much better order than asking after.

How the credit gets applied

Through documentation, not through telling anyone. A carrier works from a standard record of what is physically installed on the house, prepared by a qualified third party it accepts, and applies whatever credits that record supports. Your invoice is not that record and neither is your description of the work.

The record is factual rather than evaluative. On the openings it captures whether the glazed openings are protected, by what means, and to what standard. That is why an install that cannot be evidenced is an install that may not count, and why the paperwork below matters more than it looks like it should.

The all-or-nothing problem

The single most common disappointment is partial protection. Credits for opening protection generally rest on all the glazed openings being protected, because a building with one unprotected opening can still be pressurized through it. Nine impact windows and one original aluminum slider in the laundry room is, for this purpose, an unprotected building.

This has a direct consequence for phasing. Splitting a window project across two budget years is perfectly sensible for comfort and for condition, but if the goal is an insurance credit, the credit generally does not arrive until the last opening is done. Worth knowing before the first deposit rather than after the second.

It also means the openings people forget are the ones that cost them: the garage door, the small bathroom windows, the porch glazing, and the patio slider, which is the largest opening in most Deltona houses.

Shutters count too

Approved shutters qualify as opening protection in the same way impact glazing does. The choice between them is about cost, deployment and daylight rather than about which one gets recognized, and the comparison guide works through it.

One caveat that catches people: protection has to be the approved kind. Plywood cut to fit is not a documented product, and screens or films that were never tested to the standard do not become mitigation because they were expensive.

Keep the paperwork

After an install, keep everything the job produced, because your carrier will want evidence and so will a buyer's agent in five years:

• The product approval documentation for the units that went in, showing what they are rated to do
• The manufacturer's installation instructions supplied with the product
• The contract and the invoice, itemizing which openings were done
• The written scope showing the anchoring and perimeter detail that was quoted
• Photographs of the labels before they were removed from the glass

That last one sounds fussy and is the item people wish they had. Product labels come off the glass on handover and the information on them is not recoverable afterward without going back to the manufacturer.

The realistic summary

Opening protection is worth real money on a Florida premium, and it is worth it only when it can be evidenced and only when it covers everything. It is rarely worth buying impact glazing for the credit alone, and it is frequently worth choosing impact glazing over standard when the windows are being replaced anyway. Do the whole envelope, keep the paperwork, and talk to your own agent once the last opening is finished rather than partway through.

To price protection on your own openings, a free measured quote is the starting point, and the calculator gives a bracket first.